Windows Live Messenger – WINDOWSLIVELOGIN.DLL
Windowslivelogin.dll is the Windows Live Sign-in Helper. It installs with Windows Live Messenger (similar to Windows Messenger or MSN Messenger). You'll find the file in your C:\Program Files\Common Files\Microsoft Shared\Windows Live\ folder.
More information can be found at http://www.microsoft.com/downloads/details.aspx?FamilyID=be0caf37-f153-4081-86e9-0cbb2fece05f&DisplayLang;=en.
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Microsoft